Steady state free precession (SSFP) LV short-axis stacks as well as 2-, 3- and 4-chamber views were acquired on the same day at 9:00 (Exam A), 9:30 (Exam B) and 14:00 (Exam C) in 16 healthy volunteers. Circumferential strain systolic dyssynchrony indexes (SDI), area SDI as well as circumferential and radial uniformity ratio estimates (CURE and RURE, respectively) were derived from CMR myocardial feature tracking (CMR-FT) based on the tracking of 3 short-axis planes (basal, mid-ventricular and apical). Furthermore, 4D LV-Analysis based on short-axis stacks and all three longitudinal planes was performed to quantify 4D volume SDI. Exam A and B were compared to assess the inter-study reproducibility. Morning and afternoon scans were compared to study possible diurnal variation.

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